Portable storage device



FIG. 1 is a front-left-bottom perspective view of a portable storage device showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a front-top-right perspective view thereof;

FIG. 9 is a rear-top-right perspective view thereof; and,

FIG. 10 is another front-left-bottom perspective view thereof, illustrating a cap portion of the portable storage device is in a bending state.

The broken lines depict portions of a portable storage device in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a portable storage device, as shown and described. 